Two Egg Experiments

Make an egg bounce and create a bubble around an egg.


1. Bounce an egg.

Similar to human bones, egg shells contain calcium carbonate. Calcium carbonate can be used as a dietary supplement when a diet does not consist of enough calcium. Calcium carbonate has the formula CaCO3 and is composed of Calcium (Ca), Carbon (C), and Oxygen (O) atoms.

Put an egg in a glass.



Fill the glass with vinegar.



Vinegar contains acetic acid, CH3COOH, and is made up of Hydrogen, Carbon, and Oxygen atoms.

Wait 3 days.

The calcium carbonate within the egg shell reacts with acetic acid in the vinegar. The calcium carbonate separates into calcium and carbonate parts. The carbonate part forms carbon dioxide and can be seen as bubbles in the vinegar. The calcium part floats free.







On day 3, the vinegar is drained and the egg is rinsed. The egg shell has dissolved and leaves behind the egg membrane. The membrane holds the egg together.



The result is a translucent, flexible, bouncy egg membrane.







The membrane holds the egg together for gentle handling (and light bouncing).


2. Create a bubble around an egg.

Set out a glass of water, an egg, tongs, and a candle.



Light the candle. Use tongs to hold the egg over the flame until the egg is black.





Let the egg cool down for 5 to 10 minutes.



Slowly place black egg in the glass of water and observe the reflective, silver bubble encasing the egg.





When the egg is close to the flame, a thin coat of carbon forms on the egg shell. The chemical element Carbon is black and repels water to create the reflective, silver bubble until the air dissolves into the water.




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